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The Range
Ammo & Reloading
Pin tumbling experiment On peening
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<blockquote data-quote="swampratt" data-source="post: 3068047" data-attributes="member: 15054"><p>So I need to polish a few cases and stick them into the tumbler in a group without pins.</p><p>You may be correct.</p><p>But my issue mostly is the inside of the cases to be specific the case mouth where the bullet is seated.</p><p>This creates extra drag on my expander mandrel and pulls the case shoulders ever so much more.</p><p></p><p>I can read the differences as much as .008" difference in where the shoulder datum is at between cases.</p><p>So slicking the insides of the case necks tightens these tolerances.</p><p></p><p>That is why I brush my case necks before and after sizing and doing so has greatly improved my groups.</p><p>Not only that but I like to push my shoulders back .001" or less , when the case is rough this does not happen..many times It will pull them past where the fired round was at.</p><p>That makes for "CLICK" in an ar 15 at the worst time.</p><p>Not quite seated all the way in and the assist is of no help.</p><p></p><p>These are things I noticed..YMMV</p></blockquote><p></p>
[QUOTE="swampratt, post: 3068047, member: 15054"] So I need to polish a few cases and stick them into the tumbler in a group without pins. You may be correct. But my issue mostly is the inside of the cases to be specific the case mouth where the bullet is seated. This creates extra drag on my expander mandrel and pulls the case shoulders ever so much more. I can read the differences as much as .008" difference in where the shoulder datum is at between cases. So slicking the insides of the case necks tightens these tolerances. That is why I brush my case necks before and after sizing and doing so has greatly improved my groups. Not only that but I like to push my shoulders back .001" or less , when the case is rough this does not happen..many times It will pull them past where the fired round was at. That makes for "CLICK" in an ar 15 at the worst time. Not quite seated all the way in and the assist is of no help. These are things I noticed..YMMV [/QUOTE]
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Pin tumbling experiment On peening
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